81342056 has 8 divisors (see below), whose sum is σ = 152516370. Its totient is φ = 40671024.

The previous prime is 81342031. The next prime is 81342077. The reversal of 81342056 is 65024318.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 37332100 = 6634^2 + 6110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5083871 + ... + 5083886.

Almost surely, 2^81342056 is an apocalyptic number.

It is an amenable number.

81342056 is a deficient number, since it is larger than the sum of its proper divisors (71174314).

81342056 is a wasteful number, since it uses less digits than its factorization.

81342056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10167763 (or 10167759 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 81342056 is about 9018.9830912360. The cubic root of 81342056 is about 433.2830653064.

The spelling of 81342056 in words is "eighty-one million, three hundred forty-two thousand, fifty-six".